The same benchmark produced the following timings on a Nexus One with Android 2.2:

FloatBuffer.put( float value ): 6.876 secs

FloatBuffer.put(int index, float value): 7.006 secs

FloatBuffer.put( float[] values ): 6.800 sec

IntBuffer.put( int[] values): 1.479 secs

BufferUtils.copy(): 0.067 secs

In order to use the BufferUtils.copy() methode provided in libgdx library you need the gdx.jar, gdx-backend-android.jar, which you should add as library to your android project, and the compiled libs in the right place.